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//===- llvm/Support/GetElementPtrTypeIterator.h -----------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements an iterator for walking through the types indexed by
// getelementptr instructions.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_GETELEMENTPTRTYPE_H
#define LLVM_SUPPORT_GETELEMENTPTRTYPE_H
#include "Support/iterator"
#include "llvm/iMemory.h"
#include "llvm/DerivedTypes.h"
namespace llvm {
class gep_type_iterator
: public forward_iterator<const Type *, ptrdiff_t> {
typedef forward_iterator<const Type*, ptrdiff_t> super;
GetElementPtrInst *TheGEP;
const Type *CurTy;
unsigned Operand;
gep_type_iterator() {}
public:
static gep_type_iterator begin(GetElementPtrInst *gep) {
gep_type_iterator I;
I.TheGEP = gep;
I.CurTy = gep->getOperand(0)->getType();
I.Operand = 1;
return I;
}
static gep_type_iterator end(GetElementPtrInst *gep) {
gep_type_iterator I;
I.TheGEP = gep;
I.CurTy = 0;
I.Operand = gep->getNumOperands();
return I;
}
bool operator==(const gep_type_iterator& x) const {
return Operand == x.Operand;
}
bool operator!=(const gep_type_iterator& x) const {
return !operator==(x);
}
const Type *operator*() const {
return CurTy;
}
// This is a non-standard operator->. It allows you to call methods on the
// current type directly.
const Type *operator->() const { return operator*(); }
unsigned getOperandNum() const { return Operand; }
Value *getOperand() const { return TheGEP->getOperand(Operand); }
gep_type_iterator& operator++() { // Preincrement
if (const CompositeType *CT = dyn_cast<CompositeType>(CurTy)) {
CurTy = CT->getTypeAtIndex(getOperand());
} else {
CurTy = 0;
}
++Operand;
return *this;
}
gep_type_iterator operator++(int) { // Postincrement
gep_type_iterator tmp = *this; ++*this; return tmp;
}
};
inline gep_type_iterator gep_type_begin(GetElementPtrInst *GEP) {
return gep_type_iterator::begin(GEP);
}
inline gep_type_iterator gep_type_end(GetElementPtrInst *GEP) {
return gep_type_iterator::end(GEP);
}
} // end namespace llvm
#endif
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